docs: def isOrigin(self):
          """
          Return True if the location is at the origin.
          ::
              >>> l = Location(pop=1)
              >>> l.isOrigin()
              False
              >>> l = Location()
              >>> l.isOrigin()
              True
          """
          for name, value in self.items():
              if isinstance(value, tuple):
                  if (value < (-_EPSILON,) * len(value)
                          or value > (_EPSILON,) * len(value)):
                      return False
              if value < -_EPSILON or value > _EPSILON:
                  return False
          return True